enable dynamic binding in AppPredictionSession

Before AppPredictionPerUserService instantiates an instance of
RemoteAppPredictionService based on default componentName, do a
component lookup based on app prediction context and session id,
and switches to different service dynamically.

original architecure:
https://sequencediagram.googleplex.com/view/4764463320268800
proposed chages:
https://sequencediagram.googleplex.com/view/6517721785171968

Bug: 148173565
Test: atest AppPredictionServiceTest
Change-Id: Ic522d7ed76adafe06813ba488b83e222d61b23c1